The IS200TTURH1C is a next-generation Turbine Protection Input Terminal Board designed by General Electric (GE) for its Mark VIe series control systems. This board is the latest model in the TTUR series, primarily used in conjunction with PTUR turbine I/O packs to perform critical functions such as turbine speed monitoring, automatic synchronization, breaker control, shaft voltage/current monitoring, and overspeed protection. The IS200TTURH1C is the upgraded replacement for the original IS200TTURH1B, optimized specifically for the Mark VIe platform. It supports both Simplex and Triple Modular Redundant (TMR) control systems and is widely used in power plants, industrial turbines, and other rotating machinery for automatic control and protection systems.
The IS200TTURH1C terminal board integrates various input and output interfaces, including 12 passive magnetic pick-up speed sensors, generator potential transformers, bus potential transformers, shaft voltage/current sensors, breaker status inputs, three overspeed trip signal outputs, and relay outputs. Its design meets industrial-grade standards, featuring high reliability, strong anti-interference capability, and flexible configuration options. It is a core component for turbine protection in the Mark VIe system.
II. Main Functions
The primary functions of the IS200TTURH1C include, but are not limited to, the following:
1. Turbine Speed Monitoring
Supports up to 12 passive magnetic pick-up pulse rate sensors for measuring turbine rotational speed, with a frequency range from 2 Hz to 20 kHz, accuracy up to 0.05%, and the ability to detect speed changes as low as 2 rpm.
2. Automatic Synchronization Control
Receives generator voltage and bus voltage signals (single-phase PT, nominal 115 V rms). In conjunction with the PTUR processor, turbine controller, and excitation system, it enables automatic synchronization and grid connection of the generator.
3. Breaker Control
Provides 125 V DC output to the main breaker coil (52G). Control is ensured via three relays (K25, K25P, K25A) connected in series for safe breaker closing. Each relay features two normally open contacts in series for enhanced safety.
4. Shaft Voltage/Current Monitoring
Monitors induced voltage and current on the turbine shaft, aiding in diagnosing issues like poor shaft grounding or insulation faults. The shaft voltage signal is output as a frequency (0-2000 Hz corresponding to ±5 V DC pulses). Shaft current is measured as AC current (shunt voltage up to 0.1 V pp).
5. Overspeed Protection
Provides three overspeed trip signals output to trip boards (TRPG, TRPS, TRPA), ensuring fast and reliable activation of protection actions in overspeed conditions.
6. Diagnostic and Self-Test Functions
The board supports various diagnostic functions, including relay feedback, power loss detection, slow sync relay detection, and slow breaker detection, ensuring reliable system operation. Diagnostic results can be reported via the composite alarm L3DIAG_PTUR.
7. TMR Application Support
In Triple Modular Redundant systems, the IS200TTURH1C connects to three PTUR I/O packs. Input signals (except speed) are fanned out to all three PTUR packs for redundant processing. Output signals are controlled via a two-out-of-three voting logic.
III. System Applications
1. Application in Mark VIe Systems
The IS200TTURH1C is a terminal board specifically designed for the Mark VIe system, operating in conjunction with PTUR I/O packs. In Mark VIe systems, PTUR packs plug directly into the IS200TTURH1C, forming a compact control unit. The system supports Simplex or TMR configurations:
Simplex Systems: Use one PTUR pack, connected via PR3 and JR4 connectors.
TMR Systems: Use three PTUR packs (R, S, T), connected via six connectors (PR3, PS3, PT3, JR4, JS4, JT4) for triple redundancy.
2. Coordination with Trip Boards
The IS200TTURH1C supports connections to TRPG, TRPS, and TRPA trip boards via J4 connectors. These trip boards handle overspeed trip signals, ensuring rapid activation of protection actions during overspeed or other fault conditions.
3. Compatibility with Mark VI Systems
Important Note: The IS200TTURH1C cannot be used with Mark VI systems. For Mark VI systems, use the IS200TTURH1B terminal board.
4. Typical Application Scenarios
Gas turbines, steam turbines, combined cycle power plants
Industrial turbomachinery
Automatic synchronization and grid connection systems
Shaft voltage/current monitoring systems
Main breaker closing control
Overspeed protection systems
IV. Installation and Wiring Instructions
1. Mounting Location
The IS200TTURH1C is typically mounted inside a control cabinet using a surface mount method. Sufficient space should be for wiring and maintenance access. PTUR I/O packs plug directly into the corresponding connectors on the board.
2. Wiring Instructions
TB1/TB2: Used for connecting magnetic pick-ups, shaft voltage/current sensors, PT signals, and relay outputs. Each block has 24 terminals and accepts up to #12 AWG wire.
TB3: Optional connector for TTL active speed sensor inputs, requiring an external power supply.
Shield Terminals: A shield termination strip attached to chassis ground is located left of each terminal block for connecting signal shield grounds.
3. Jumper Configuration
JP1, JP2: Used to select the drive mode for relays K25 and K25P. In Simplex mode, set jumpers to SMX. In TMR mode, set jumpers to TMR.
WJ1: Wire jumper, installed by default. Removing WJ1 isolates the K25A control line from the TRPX board for specific configuration needs.
4. Cable Connections
Simplex Systems: Use PR3 and JR4 connectors to connect the PTUR pack.
TMR Systems: Use all six connectors (PR3, PS3, PT3, JR4, JS4, JT4) to connect three PTUR packs.
Trip Board Connection: Connect TRPG, TRPS, TRPA trip boards via J4 connectors.
V. Diagnostics and Maintenance
The IS200TTURH1C, in conjunction with PTUR I/O packs, implements several diagnostic functions to ensure high system reliability:
| Diagnostic Item | Description |
| Relay Driver Feedback | Checks if the relay drive signal matches the control signal; a fault is created if lost. |
| Relay Contact Feedback | Checks if the contact state matches the control signal; a fault is created if lost. |
| Power Loss Detection | Checks if solenoid power is lost; a fault is created if lost. |
| Slow Sync Relay Detection | Detects if the sync check relay or auto sync relay response is too slow; a fault is created. |
| Slow Breaker Detection | Detects if the breaker response is too slow; a fault is created. |
| K25 Relay Stuck Detection | Detects if the K25 relay is stuck; a fault is created. |
| Composite Diagnostic Alarm | Any fault triggers the L3DIAG_PTUR alarm. |
| ID Chip Verification | Verifies if the connector ID matches, preventing hardware incompatibility. |
All diagnostic signals can be reset using the RESET_DIA signal. Fault latching is supported to aid maintenance personnel in problem identification.
VI. Configuration and Compatibility
Configuration Method: Configured via jumpers JP1, JP2 and wire jumper WJ1; no DIP switches are present.
Compatibility: Supports operation with PTUR I/O packs, TRPG, TRPS, and TRPA trip boards.
Important Note: The IS200TTURH1C is not compatible with Mark VI systems and does not support VTUR processors. Mark VI systems require the IS200TTURH1B.
